Steam boiler



D. W. ROBB.

STEAM BOILER.

APPLICATION FILED JULY 31,1919.

Patented Nov. 7, 1922.

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DAVID WENDELL BOBB, OF CLEVELAND, OHIO.

STEABI BOILER.

Application filed .l'uly 31,

To all whom it may concern:

Be it known that 1, DAVID ll nnnnnn Rose, a subject of the King of Great Britain, and resident of Cleveland, county of Cuyahog'a, State of Ohio, have invented certain new and useful Improvements in Steam Boilers; and I do hereby declare the following to be a tull clear, and exact description or" the same reference being had to the accompanyinp; drawings forming part of this specification.

The present invention relates to steam. boilers of the fire tube type and is especially applicable to boilers wherein the combustion chamber is located within the boiler shell and the products of combustion pass from the rear end of the combustion chamber forwai'dly through fire tubes within the shell above the combustion chamber. Although applicable to boilers wherein the back end of the same is formed by a dry sheet or head, as in the well known continental type of boiler, it is shown in the accompanying drawing in connection with a wet back combustion chamber.

The objects of the invention are to secure a more effective circulation of the water to reduce the friction of the steam in its pasto the steam drum. by shortening the necessary path of travel, and to permit of the most effective location and arrangement of the fire tubes without interference therewith by water circulating ducts.

Referring to the accompanying drawings:

Fig. 1 is a sectional elevation of a steam boiler embodying the present invention indicatedby the line 1-1, Fig. 2; and

2 is a front elevation with the smoke box omitted.

Like letters of reference indicate the same parts in the several views. v

The boiler adopted for illustrating the invention embodies a substantially cylindrical boiler shell A having an internal combustion chamber or combustion chambers preferablyformed by cylindrical corrugated shells B secured in the front head A of the boiler and at the rear ends secured in the front diaphragm B of a circular or cylindrical enlargement of the combustion chamber also located within the boiler and havinc its rear diaphragm 13 connected by suitable stay bolts F) with the rear head A of the boiler shell. The rear circular or cy lindrical enlargement of the combustion chamber is connected through suitable fire 1919. Serial N0. 314,508.

tubes C with the front head A, said fire tubes being grouped over or around the combustion chambers B and inasmuch as the boiler does not embody any water circulatmg ducts or passages within the cylindrical shell, the said fire tubes may be grouped or arranged in the most advantageous relation, so as to' secure the maximum heating effect. The fire tubes C at their forward ends open into a smoke box D of conventional form from. which the products of combustion are led away to a suitable stack. The enlargement of the combustion chamber may be connected with the front head A of the boiler by suitable stay bolts or rods E of approved form, and the grates F and bridge walls F located within the smaller cylindrical portions of the combustion chambers are of conventional or preferred construction and arrangement.

Above the cylindrical shell A of the boiler there is located a relatively long steam and water circulat ng drum the front end of which extends beyond the front end of the boiler, and such drum is connected with the boiler at its rear end, a short distance in front of the enlargement of the combustion chambers, by a relatively large neck Hafi'ording an unrestricted communication between the boiler shell and steam drum. The front portion of the steam drum G is supported on the boiler shell by means of a cast ironsaddle K and the extreme front end of sa d steam drum is in communi cation w'th the bottom front portion of the shell A through a relatively large circulat ing pipe connection which it will be noted, is entirely on the exterior of the boiler and drum, whereby it is accessible and the internal arrangement of the combust'on chamher and the fire tubes is in no wise interfered with. Preferably this pipe connection consists of two vertically disposed pipes L bent to conform to the cross sectional contour of the shell A so that said pipes will not prevent ready access to the fire doors and combustion chambers orany other portions of the front of the boiler shell. If desired, however, one ppe L may be dispensed with and I do not wish to be limited to the use of any particular number of pipes except as specified in the claims. To facilitate cleaning, a man hole or clean-out opening M is conveniently located'in the rear end of the steam drum.

With the described arrangement of the parts there is a positive circulation the water down through the external circulating pipes L to the bottom of the boiler shell to take the place of the water converted into steam and passed off through the neck into the steam drum from whence it passes out through the steam outlet S in the top of the drum. The communicating neck through which the steam passes into the steam drum,

it will be noted, is located in such position near the rear end of the boiler that the steam has the shortest possible path to travel in reaching the drum. ater and steam carried through the neck into the steam drum will naturally flow toward the front of the drum but in order to increase this effect, there is preferabl I located over the neck opening a curved deflector O which extends up into the drum to approximately the working water level therein, and is adapted to effectually prevent the water from being thrown into the steam space by ebullition.

Feed water is conveniently supplied through a pipe P which enters one side of the steam drum near the center and dis charges at a point below the working water level in proximity to the entrance. to the external circulating pipes L, thus affording means for bringing the temperature of the feed water up without materially affecting the steaming qualities of the boiler, inas much as the fresh water will be effectually heated and commingled with the circulating water before it reaches thesteam generating area. In the opposite side of the steam drum there is an auxiliary supply pipe P similar in all respects to the main feed pipe P. Both of the feed pipes P and P extend forwardly in the steam drum toward the en trance to the circulating pipes L so that the fresh water will be discharged towarc s and adjacent to the entrance to said pipes L.

With a boiler constructed as described, all complication in the internal arrangement of the parts is avoided, and at the same time the circulating effect of the construction is equal,

not superior, to the best previous practice, wherein the circulating ducts arearranged between or around the fire tubes.

\Vhat I claim is:

1. In a marine boiler such as described. the combination withthe boiler shell haying fire doors therein, combustion chambers located within the shell and fire. tubes extending from the rear end of the boiler to the front end for the passage of products of combustion, of asteam drum located in hori-- zontal position above the boiler shell, acommunicat ng neck connecting the ,shell and drum 1n proximity to the rear end of the: shell and drum, said neck terminating be low the working water level in the drum, and an external circulating pipe connection spaced from the boiler and through which:

all of the circulating water passes from the drum to the shell, said pipe connection being located in. front of the shell and extending downwardly at the side of the shell to give access to the fire doors, and. said. pipe connection being at its upper end in communication with the front end of the drum and at its lower end in communication with the lower front end portion of the shell whereby the water will circulate from one end of the shell to the other and. in a sh gle continuous path through the shell an cun'i.

2. In a marine boiler the comb1n with the cylindrical boiler sh ll, lire doors, combustion chambers located within said shell and having a circular enlargement at its rear end within the shell, fire tubes con necting said enlargement of the combustion chamber with the front head of the boiler shell whereby the water may circulate freely throughout the interior of the shell, a steam drum located in horizontal position above and parallel with the boiler shell and with its front end projecting beyond the front end thereof, a neck forming a communication between the boiler shell. and drum near the rear end, said neck terminating below the working water level in the drum, a pair of vertically disposed circulating pipes connected with the lower portion of the drum in front of and spaced from the boiler shell and at their lower ends in communication with the bottom portion of the boiler shell whereby the entire circulation occurs through the neck connection and downwardly through said external. pipe connection and through approximately the entire length of the shell to said neck connection, said pipes conforming to the contour of the front end of the boiler shell and being lo cated to one side of the fire doors to give access to said doors.

I 3. A marine boiler embodying a substantially cylindrical shell, fire doors, two cylindrical combustion chambers located side by side within the shell and both communicating with a circular enlargement within and near the rear end of the shell, fire tubes connecting said circular enlargement with the front head of the shell whereby products of combustion will be conducted from. the rear. enlargement of the combustion chambers to the front end of the. boiler and the water may circulate freely throughout the interior .of the shell a steam drum arranged in substantially horizontal position above and parallel with. the boiler shell, the front end of said drum projecting beyond theshell, there being a neck connection between the drum and shell, near their rear ends. said neck connection terminating below the working water level in the drum, and an external iertically arranged circulating pipe connection extending from the bottom of the pr0- jecting front end of the drum and down in front of the shell butto the sides of the fire doors to the lower portion of the shell in front of the combustion chambers, whereby the water will circulate from one end of the shell to the other and in a single continuous path through the shell. and drum and a deflector extending over the neck toward the circulating pipe connection for directing the circulation and preventing water from being thrown into the steam space by ebullition.

l. In a marine boiler of the class described, the combination with a boiler shell and a combustion chamber located within the shell and having fire tubes extending therethrough whereby the water may circulate freely throughout the interior of the shell, of a steam drum above the shell and extending longitudinally thereof, a neck forming a communication between the boiler shell above the combustion chamber at the rear portion of the steam drum said neck connection tern'iinating below the working Water level in the drum, a deflector Within. the steam drum overhanging the openin of the neck for directing incoming fluid tor-wardly along the steam drum, a pair of circulating pipes communicating with the lower front portion of the steam drum and extending downwardly therefrom to and communicating with the lower front portion of the boiler shell, whereby the water will circulate from one end of the shell to the other and in a single continuous path through the shell and drum and a feed water intake pipe extending through an intermediate port-ion of. the drum and projecting forwardly therein toward and discharging toward and adjacent to the upper end of the circulating pipes.

DAVID WENDELL ROBE. 

